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The black thing at the end is the "keyless chuck". Grasp it just behind the silvery tip of the chuck with one hand, and grasp the knurled ring just behind THAT area with the other hand. Twist the "front" hand counterclockwise while you twise the "rear" hand clockwise. That will loosen the chuck so you can change bits.
It only accepts 1/4" hex shank bits and nut drivers. Mine just pops in and to release it, you push the black collar around the bit down. Cannot put round end bits in it. Only hex shanks
Put the dril in forward, hold the collar, and just bump the switch long enough to get the internal portion to turn. The bit will likely fall out at that point.
Keyless chucks are make in a way that each of the jaws have an exposed heel that can grab onto larger bits that were inserted too far into the chuck.
Dewalt's DW106 does not have a set screw inside the keyless chuck to hold it on. This means the chuck was put on with enough lok-tite and torque to keep it on under most circumstances so getting it off will not be easy. If you're using the allen wrench-in-the-chuck method, give it a good firm whack until it breaks free.
My solution when the other mentioned ideas didn't work was this: I removed the 7 Torx #20 screws ( a common screw driver will work as well) and removed the housing half to expose the shaft. The chuck shaft bearings and gear lifts out as one assembly. Directly behind the chuck there is a half inch section of shaft exposed. I mounted a vise grip on the shaft (won't hurt it) and clamped the affair in a bench vise. With a 5/16" allen wrench mounted in the chuck and using a mallet I spun the chuck off with a solid smack counter clockwise . Very simple and easy .
Keyless Chucks Open chuck jaws by turning plastic collar with fingers and insert shank of bit about 3/4" into chuck. Tighten plastic collar CLOCKWISE while depressing spindle lock button (F) on the right side of the tool housing (Fig. 4). To release bit, turn plastic collar COUNTERCLOCKWISE while depressing the spindle lock button (Fig. 4). NOTE: DO NOT DEPRESS LOCK BUTTON WHILE OPERATING DRILL or while the chuck is moving.
Link to manual:- http://servicenet.dewalt.com/Products/Detail?isId=true&productNumber=DW222&selectedType=2752#
hold the drill so the handle is facing you and the drill bit is facing away then twist the chuck clockwise. some quick chucks have two halfs in which case you hold the back collar (nearest you still) if its really tight it the drill bit into the chuck with something soft like a piece of wood so as not to damage the drill
That tool comes standard with a keyless chuck so all you should have to do is grip the collar and turn it to loosen bit. If it is stuck you might try a rag of some sort on the collar and use the motor to loosen it up. Let me know if you need more help.
They are not, you need to buy a new chuck. The tolerance is so close on the collar that you can't repair it. On some of the older keyed chucks you could but the jaws cost about as much as a new one.
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